"Tonight is all about love!" The 25-year-old announced to the audience.

She didn't address the gigantic rock on our finger, but the sudden appearance of the stunning stone has sparked engagement rumours.

A close insider recently told HollywoodLife.com that the star has been leaning on her bae, Mac Miller during the whole ordeal.

“Mac has been an absolute rock for Ariana during these her darkest and most challenging days. She has been completely shook by the horrible tragedy at her concert and has been unable to sleep without having nightmares about the incident,” the source revealed.

“Mac has not left her side, holding her at night, helping her fight back the tears. While the bombing has been terrible in every way, it has brought Ariana and Mac closer together than ever as a couple. She doesn’t know how she would be getting through this ordeal without her loving boyfriend," they added.

As the pair has been getting closer and closer, we wonder if Mac has *finally* popped the question?